JPH0268161A - Flat valve member for spray distributor - Google Patents

Abstract

PURPOSE: To impart such a touch as to allow the free movement of a finger by providing the end on the innermost side of the inner hollow portion of a valve member with a reduced diameter portion in such a manner that the initial movement of the valve member 11 is made easier to ease the movement start of an actuator. CONSTITUTION: The outer end of a passage 81 of a pump stem 77 including a piston 75 moving back and forth within a pump chamber 73 at its end is formed as a dispensing outlet and the inner end thereof is formed as an inlet hole 83 of an axial direction. The valve member 11 is provided with an outer portion 13 having a flat outer end 14 for increasing the diameter of the sealing area in the outlet. A ball sealing portion 27 of a circular truncated cone shape tapering at 12 deg. and 5 deg. for the purpose of providing a tight seal between a ball 23 and the valve member 11 is disposed in a recess 17 in the interior of the valve member 11. Further, the innermost end of the inner hollow part 15 of the valve member 11 is provided with the reduced diameter portion 18 so as to ease the initial movement of the valve member 11. The creation of vacuum by the seal is lessened by a molded-in protrusion 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates generally to spray pumps, and more particularly to an improved flat top valve member useful in pressurized spray pump dispensers.

[Description of prior art]

The emergence of regulations for the use of fluorocarbons in spray dispensers and concerns about the impact of fluorocarbons on the ozone layer have made it important to develop pumps capable of spraying in fine spray formats previously available only through pressurized vessels. It is becoming.

The most common suggestion for providing good atomization in pumps is to perform some form of precompression. A number of different precompression pumps have been developed with arrangements in which the outlet valve does not operate until a certain pressure within the pump chamber is reached so that fine atomization without dripping can be achieved. Such pumps are disclosed in U.S. Pat. Nos. 4,025,046 and 3,399,83.
No. 6, No. 4.089.442 and French Patent No. 2,249,716. The pumps described in these patents include a pump chamber within which is disposed a reciprocating piston containing an integral pump stem.

An axial hole is provided in the center of the piston, the inner end of which closes the inlet hole to said axial hole until pressure is built up in the pump chamber by pushing the pump stem inward. A valve member is provided. Each pump also includes biasing means, typically a spring. The biasing means forces the valve member against the inlet aperture until a sufficient differential pressure builds up to pull it away from the inlet aperture. All such pumps also include valve means at the inlet to the pump chamber. This valve means allows refilling of the pump during the outward stroke of the pump stem, but is intended to prevent backflow of material from the pump chamber during the dispensing stroke. Most inlet valves are check valves. Thus, U.S. Patent No. 3,399,836
A ball check valve is used for this purpose. In French Patent No. 2,249,716, the check valve is in the form of a rubber gasket placed along the extension of the valve member and retained by a plastic cover. When the pump is activated, the pressure generated therein causes the pump stem gasket to slide inwardly, thereby sealing the opening in the inner end of the pump chamber. After dispensing, the pressure differential due to the partial vacuum drawn inside the pump chamber causes the gasket to move upwardly, opening the passageway for refilling.

A different type of check valve is used in US Pat. No. 4,089,442. A valve member sealing the inlet hole of the pump stem includes a hollow portion extending through a throat located at the inner end of the pump chamber. A spring is disposed within the hollow portion and a hollow compartment is disposed in communication with the container. The hollow section has a larger diameter than the remainder of the valve member.

The width is narrower at the lower position of the artificial hole that enters the pump stem. This allows the formation of an opening from the hollow side of the valve member. If no pressure is created in the pump chamber, the pump chamber will be pushed inward and the opening will close. If a differential pressure is present, the pump chamber is forced upward, which allows fluid to flow through the hollow portion of the valve member and into the pump chamber.

Another device using a conventional ball check valve is described in US Pat. No. 4,051,983. In the embodiment described herein, the member referred to as the valve member, which acts to both seal the inner end of the pump chamber and open the inlet hole to the pump stem, is made from three parts. The upper portion extending into the piston and pump stem assembly opening together with the inlet hole to the pump stem constitutes the valve portion. The valve portion has a hollow portion at its inner end.

The hollow portion retains the ball and has a plurality of openings.

In order to hold the ball in place, a third part (constituting an extension of the valve part) is inserted into the hollow part. This third part provides the necessary sealing of the inner end of the pump chamber.

In the embodiment of the aforementioned U.S. Pat. No. 4,025,046, particularly shown in FIG. A throat formed in the part is used cooperatively. The valve member is connected to the container and the pump chamber by means of appropriate channels which taper or are arranged in order of size when the pump is in the rest position and the valve member, piston and dispensing stem are all completely outside. The structure is designed to open a communication route between the two. It was first disclosed in U.S. Pat. No. 4,113,145, dated September 12, 1978, and U.S. Pat.
It was approved as a patent as an improvement of No. 346.

While this principle works very well in most instances, there are situations in which it does not work as desired, particularly when the pump chamber is relatively small or when precisely measured doses are required.

Most importantly, if the user does not return the pump stem to its fully outer position, i.e. there is insufficient stroke, the inlet valve to the pump chamber will not open and the pump chamber will not refill. Not done. It should be noted that in such an arrangement the inlet valve to the pump chamber will not open until the piston has approximately reached its rest position.

On the other hand, when using a conventional check valve, the pump chamber begins to refill almost simultaneously with the beginning of the outward stroke. This allows for short strokes. Problems also arise if the user allows the pump stem to exit slowly rather than all at once, which can cause air to leak around the piston and make refilling inappropriate. do.

Accordingly, efforts have been made to provide improved valve members for pumps of the general type described above that have a limited number of parts and are easy to assemble.

Many of these objectives were achieved by the structure of US Pat. No. 4,230,242. In this patent, the pump includes a valve member having an outer rigid portion projecting into an opening below the piston and serving to close the inlet hole to the pump stem, and an inner portion hollow on the inside and adapted to receive a biasing spring. It has an expanded category. The valve member is molded in one piece and has a recess formed just outside the hollow region of the inner enlarged section. The recess has a narrow throat at the location where it communicates with the hollow region. The diameter of the throat is smaller than the remainder of the recess and the diameter of the steel ball used as a ball check valve. The recess is maintained in communication with the pump chamber by an opening extending through the valve member. In this simple assembly, the valve member acts as a triple seal valve member. That is, the outer portion of the valve member serves to seal the inlet hole to the pump stem, the inner portion of the valve member serves to seal the throat at the inner end of the pump chamber, and the ball check valve serves to seal the inlet hole to the pump stem. Provides further sealing action during dispensing.

The use of the valve member in combination with a flexible annular seal provides an improved seal at the pump chamber inlet while still allowing rapid refilling with the ball check valve. The inner portion of the valve member that is hollow to receive the spring may be made to form an additional mouth valve or it may be made to be in constant sealing contact with the flexible annular seal.

Despite the benefits provided by the pump configuration of U.S. Pat. The problem arose because it was considered to be a minimum. Minimizing the area of the exit zone location has generally been considered desirable since effective sealing is more easily achieved in small areas than in large areas. This means that the area available for the pressure mechanism to act against the biasing force and to open the outlet is not substantially different from the area available immediately after opening.

Therefore, the user must continuously apply the same level of force to keep the pump operating against the spring force throughout the entire stroke. If the user is firm and strong (
When you press down on the actuator, the balloon only pops up once. However, if pressure is applied slowly and smoothly, the eruption will be continuous, allowing the user to vary the dose considerably.

A solution to this problem was proposed in US Pat. No. 4,735,347 for pressurized pumps that do not use ball check valves. The pump described here has a substantially increased sealing area at the outlet, for example by a factor of ten. This increase in seal area has many effects, firstly.
The piston area is reduced. The reduction in effective piston area increases the finger pressure to apply a constant force.

The area of the valve member that is subjected to pressure prior to opening is also reduced.

This ultimately allows the use of weaker springs to generate a constant pressure. The area on which pressure can act upon opening of the valve member is substantially increased.

However, after opening, the pressure will drop somewhat due to the resistance to flow there, in particular the resistance of the actuating actuator.

The pressure within the chamber thus acts over a much larger area and generates a greater force which forces the valve member down against the biasing force of the less resilient spring as described above. This produces a result analogous to the force exerted by a finger to overcome static friction and push something down. It is virtually impossible for a normal person to control the movement of the finger after applying force to the finger while releasing back pressure to a certain degree. As a result, a full stroke is achieved with − times of fine spray,
It sprays at a higher pressure than other pumps.

While increasing the seal area at the exit location through the pump stem provides the benefit of %l shot dispensing, it is also useful for valve members using ball check valves such as U.S. Pat. No. 4,230,242. Various problems also arise in this case.

In particular, the use of large diameter stem tops requires a tight seal between the ball and the recess in which it seats. However, providing such a tight seal increases the vacuum created after product is dispensed from the pump chamber. This vacuum results in a pump lockup condition in which the pump stem cannot return from its outermost position because the spring cannot overcome the force of the vacuum.

Furthermore, since a large force is required to start the pump stem operation, a high pressure must be accumulated before the pump stem is activated, which may cause discomfort to the user.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a flat top valve member for use in a pump assembly of the type shown in U.S. Pat. No. 4,230,242 to provide one shot dispensing. It is in.

Another object of the present invention is to provide a valve member that overcomes the problems discussed above with respect to the use of flat-top valve members in such pump assemblies.

[Summary of the invention]

Said object is solved by the structure of the present invention.

The valve member of the present invention has an outer portion with a flat outer end to substantially increase the diameter of the sealing area at the outlet (e.g., rather than one-third the diameter of the inner portion of the valve member). Although this increase in seal area diameter is not as dramatic as the increases in the prior art applications discussed above, it provides some of the known benefits. Additionally, some conventional pressure pumps have similar ratios (e.g., U.S. Pat. No. 4.3
89.003 and 4,113,145), which are noted below in combination with such ratios to provide improved operation that can be achieved using the pump of the present invention. does not provide any other features. The recess within the valve member is modified to provide a frusto-conically shaped ball seal portion that is sloped at angles of 12° and 5°, respectively, to provide a tight seal between the ball and the valve member.

The innermost end of the inner hollow portion of the valve member is provided with a reduced diameter portion to facilitate initial movement of the valve member. This facilitates the initiation of movement of the actuator and gives the user the feeling of being able to move his or her fingers freely. The hollow portion of the valve member is provided with a perforated molded projection for releasing the seal between the valve member and the flexible annular seal. This alleviates the creation of a vacuum caused by the tight seal between the ball and ball seat.

[Explanation of Embodiment 1] Fig. 1 is a sectional view of the valve member of the present invention, and Fig. 2 is a sectional view of the valve member of the present invention.
FIG. 3 is a plan view of the valve member shown in FIG. Valve member 11 has an outer portion 13 with a sealing surface 14 used to seal the outer bore in a manner described in more detail below, and an inner hollow portion 15 with a hollow recess 17. The diameter of the area sealed by the sealing surface 14 is at least one third of the outer diameter of the inner hollow portion 15, which provides a flat appearance to the top of the valve member.

An intermediate hollow part 19 interposed between the inner hollow part and the outer part of the valve member forms a recess 21 in which a ball 23 (see FIG. 3), preferably made of a steel ball, is arranged. The recess 21 is connected to the valve member 11 through a narrow throat portion 25.
It communicates with the inner hollow part 15 of. Narrow throat part 2
From 5 a sloping frusto-conical section 27 extends outwardly and terminates in an oppositely sloping rib section 31. Rib portion 31 comprises a rib connecting outer portion 13 of valve member 11 to intermediate hollow portion 19 . The frusto-conical portion 27 is inclined at a small angle with respect to the axis A of the valve member to ensure a good seal between the ball 23 and the frusto-conical portion 27. Generally, the smaller the angle of inclination, the better the seal achieved.

However, in the present invention, the inclination angle with respect to the valve member is lO
It has been found that if it is less than or equal to 10°, the seal will be too good and the ball 23 will tend to stick to the seat formed by the frusto-conical portion 27. The best results were thus achieved with an inclination angle between 10° and 20°, preferably 12°. The rib portion 31 is also
It is tilted at a small angle (preferably 5°) with respect to the axis A + C of the valve member. A molded projection 16 is provided on the inner hollow part 15 in a position close to the intermediate hollow part 19 . The structure and function of this molded protrusion 16 are as follows from 4(a) to 4(c).
) is explained in detail below with reference to the figures.

At the innermost end of the outer surface of the inner hollow section 15 is also provided a reduced diameter section 18 and a tapered coupling section 18c connecting the reduced diameter section 18 to the remainder of the inner hollow section 15. Diameter reduction is relatively small, preferably less than 5%, which provides important benefits. For details, please refer to the valve member 11
The smaller diameter of the end that first contacts the flexible annular seal 107 results in an imperfect seal between these two elements, thereby causing piston 75 and Initial movement of the valve member 11 is facilitated. This provides the user with an effective feeling of creating a moment that provides less resistance to the initial movement (and thereby helps the initial movement create the force necessary to create enough pressure to operate the pump). The diameter reduction also helps prevent pump lockup due to weakening of the seal between the end of the valve member and the annular seal 107.

The valve member, with the exception of ball 23, is molded in one piece from a plastic such as polypropylene. The ball is snapped into position from the inner end via the narrow throat portion 25. In the illustrated sealing situation, the ball rests against the frusto-conical portion 27. The inner diameter of the rib portion 31 of the recess is larger than the outer diameter of the ball, so that under the influence of the differential pressure the ball moves outwards and the lip 33 passes through the opening 35 in the earthen floor, as follows with reference to FIG. allows liquid to flow into the pump chamber in the manner described in .

FIG. 3 illustrates a pump using the valve member of the present invention. The particular pump illustrated in FIG. 3 is adapted to be threaded onto a bottle and therefore has internal threads on the inside of the side wall 45, which has a cylindrical or slightly frusto-conical cross section. A cap 41 is provided. However, pumps that use a cup for attachment to a bottle or can in place of a cap may equally be made using the valve member of the present invention. The pump of the invention is incorporated inside the cap 41.

The cylindrical formation has a horizontal portion 49 extending from the side wall 45 which is slightly frustoconical in shape. This horizontal portion 49 is a vertical portion 51
and forming a further horizontal portion 53. The vertical portion 51 and the horizontal portion 53 form an annular recess 47 .

The annular edge of the horizontal portion 53 forms a central opening 57 of the cap. An additional vertical wall 59 projects outwardly from the horizontal portion 49. The vertical wall 59 can be used as a guide for the spray head. Below the horizontal portion 49 an additional cylindrical recess 61 is formed. A protrusion 63 is molded directly below the cylindrical recess 61. This creates a horizontal flange portion 67 at its upper or lower end inside the cylindrical recess 61.
This enables the elastic engagement of the pump body 65 having the following. The horizontal flange portion 67 is snapped into position inside the cylindrical recess 61 beyond the projection 63. Horizontal flange portion 67 and horizontal portion 49 are molded with annular projections 69 and 71 having triangular cross-sections that facilitate sealing in place with each other. On the outer or upper end portion of the pump body, a longitudinal flange portion 68 is also provided, and on the outer portion of the annular recess 47 an annular gasket 48 is arranged. A second annular gasket 52 is disposed between the cap 41 and the pump body 65.

Positioned within the pump chamber puff 3 of the pump body 65 is a stem and piston assembly 75 comprising a stem portion 77 and a piston portion 79 at its inner end. Stem portion 77 includes an outer passageway 81 extending through an axial inlet hole 83 . Immediately inside the axial inlet hole 83 is a hollow recess 85 shaped to receive the outer portion 13 of the valve member 11 . The axial inlet hole 83 has a frusto-conically shaped inclined surface inclined at an equal angle to the sealing surface 14 such that the sealing surface 14 is in contact with the frusto-conically shaped inclined surface of said axial inlet hole 83. It is designed to come in contact with the state.

The generally cylindrical piston portion 79 includes an upper cylindrical projection 87 and a lower cylindrical projection 89 for its attachment to the stem. The lower cylindrical projection 89 is sloped slightly outwardly to make firm contact with the pump chamber 73.

The valve member of FIG. 1 is also disposed within the pump chamber in the position shown such that its outer portion 13 is positioned within the hollow recess 85 and the sealing surface 14 closes the axial inlet hole 83. be done. In addition to the pump chamber, the pump body also includes an annular chamber 93 below it. The annular chamber 93 has a radially outer wall 95 and a radially inner wall 97. The radially inner wall 97 is sized to receive a bayonet tube 99. A horizontal wall 101 with holes 103 is integrally molded with the radially inner wall 97 . The radially outer wall 95 is the wall 105 of the bomb chamber 73.
diameter is smaller than. A stepped portion 106 is thus formed between the wall lot and the radially outer wall 95. A flexible annular seal 107 is disposed at this location in the pump chamber. , the flexible annular seal 107
is flexible and can be reversed. Flexible annular seal 1
07 is a portion 109 that projects axially outwardly and radially inwardly and makes sealing contact with the outer side of the lower portion 15 of the valve member 11;
Equipped with. A protrusion 111 is formed on the inner wall of the pump chamber 73 to maintain a flexible annular seal 107. Annular chamber 93 also includes an inner annular wall 113 connecting radially outer wall 95 and radially inner wall 97 .

Between the inner annular wall 113 and the outer end 121 of the hollow recess 17 of the valve member, which is the position where the lower part 15 and the intermediate hollow part 19 are connected, the valve member 11 is moved outwardly. A spring 123 is provided to bias the spring 123 . This outward biasing of valve member 11 brings sealing surface 14 into contact with axial inlet hole 83 while simultaneously biasing piston and stem assembly 75 to the axially outward position shown.

In the position shown, material leakage from the pump is prevented by the upper cylindrical projection 8 of the piston, even if the container is reversed.
7 annular gasket 48 and the seal formed by annular projections or sealing edges 71 and 69. In operation, an actuator is typically positioned over the end of stem portion 77, thereby depressing the stem portion. During the initial push down, the piston increases the pressure inside pump chamber 73, assuming that it is full. This pressure acts on the ball 23 causing it to seal against the frusto-conical portion 27. A seal on the inner end of pump chamber 73 is maintained by a flexible annular seal 107.

Since the aperture size through the inner hollow portion 15 of the valve member is greater than or equal to the aperture size of the axial inlet hole 83, a net force difference in the inward direction is created and the pressure within the pump chamber 73 is increased. This force is sufficient to overcome the force of spring 123. This force causes the valve member 11 to move inwardly and pull the frusto-conical portion 91 away from the axial inlet hole 83, thereby allowing dispensing to begin only after a predetermined pressure has built up in the pump chamber. Dispensing continues until the piston is completely moved inward.

As previously explained and shown in FIG.
is wider than conventional valve members. This flat top section provides important benefits in certain applications.

For example, when trying to move the valve member 11 inward against the biasing force of the spring 123, a finger force (for example, approximately 2
．． The area of the part where 27 kg) acts is the inner hollow part 1
5 minus the area of the sealing surface 14. Thus, by increasing the area sealed by the sealing surface 14, the area on which the pressure created by the finger acts is reduced, and thus the spring 12
The force in the downward direction applied to the valve member 11 against the biasing force of No. 3 can be small. Therefore, even if the pressure in the pump chamber is to reach higher levels for better atomization performance, a much weaker spring can be used. Such a spring can now be designed solely to return the piston and valve member to their original position, thereby creating a sealing condition. No further force is required to ensure atomization. Rather, these forces are accumulated by hydraulic pressure.

Furthermore, since the sealing surface 14 is in substantially planar rather than line contact with the stem portion 77, a good seal is ensured at this location.

Another important benefit of using a valve member with a flat top portion is that in the embodiment of FIG. 83
It is best understood by considering what happens when the Specifically, during the dispensing stroke after the first stroke, the pump chamber 73
is filled with fluid. Thus, the pressure built up in the pump chamber upon initial opening before significant flow occurs is maintained at that level, at least momentarily. This pressure acts on the area it was previously acting on, and
Acting on the additional area of the axial bore sealed by the sealing surface 14. Due to the increased diameter of the area sealed by the sealing surface of the flat top portion, the additional area is increased and therefore the force acting on the spring is increased. At this point the valve member does not move and the user pushes or "inserts" the stem portion with a finger, which builds up hydraulic pressure. When the valve opens, the hydraulic pressure acting on the increased surface area increases the force on the stem portion. The valve member 11 thereby moves inward rapidly and the inward movement of the fingers for the entire stroke of the pump is no longer able to stop, resulting in a single ejection of atomized liquid at a much higher pressure than in conventional devices. distributed.

At this point, the user typically releases the actuator, causing the force of the spring 1230 to force the valve member 11 and the stem and piston assembly outward.

However, in some examples, the annular seal 1 of the valve member 11
07 and the inner hollow portion 15 was found to be too tight for the spring to return the valve member 11 and stem and piston assembly 75 to the outer position. Thus,
In another aspect of the invention, a molded projection 16 is provided on the radially outer surface of the inner hollow section 15 near the intermediate hollow section 19. This feature is best illustrated in Figures 4(a) to 4(c). Specifically, FIGS. 4(a) to 4(c) illustrate the structure of the molded protrusion with accurate dimensions and shapes. As shown in FIG. 4(b), the molded projection 16 is relatively small in the radial direction and includes a slot at its point of greatest radial extension that acts as an air passage. As shown in FIG. 4(c), the molded projection is relatively long in the circumferential direction (and the surface of the inner portion is sloped at an angle of about 10°. Figure 3 illustrates a schematic view of a molded protrusion, its arcuate shape being better shown and the elongated hole formed in its maximum radial extension.

In the situation where the valve member is positioned innermost, i.e. in a situation where the valve member can form a tight seal with the annular seal 107, the molded protrusion connects the annular seal 107 and the inner hollow portion 15.
Also, the molded protrusion 1
Air can be delivered through the slot formed in 6 so that the vacuum in pump chamber 73 is momentarily not maintained. The spring 123 is then able to begin returning the valve member to its outermost position.

As the spring 123 pushes the valve member 11 and the stem and piston assembly outward, the pump chamber 7
3. A partial vacuum is created inside.

During the dispensing stroke, the container is vented by the gap between the central opening 57 and the stem portion 77, so that the contents inside the container are subjected to ambient air pressure through the hole 125 leading to the interior of the container. The resulting pressure difference is at pole 2.
3 to move it outwards, thereby establishing a flow through the extraction tube 99, the hollow recess 17, through the opening 35, past the ball 23 and into the pump chamber 73. Such refilling begins as soon as the outward stroke of the pump stem begins. Thus, even if the user restricts the movement of the stem portion, ie moves the stem portion slowly or moves the piston portion 89 in small increments, the pump chamber 73 will be refilled.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a valve member of the present invention. 2 is a plan view of the valve member of FIG. 1; FIG. FIG. 3 is a sectional view of a pump in which the valve member of FIG. 1 is incorporated. 4(a) is a schematic illustration of a molded projection of the valve member of FIG. 1; FIG. FIG. 4(b) is a schematic diagram of the molded protrusion of the valve member of FIG. 1; FIG. 4<C) is a schematic view of the molded protrusion of the valve member of FIG. 1. The names of the main parts in the figure are as follows. 11: Valve member 13: Outer portion 14: Seal surface 15: Inner hollow portion 16: Molded protrusion 17: Hollow recess 18 Two reduced diameter portion 18c: Taber joint portion 19: Intermediate hollow portion 23: Ball 25: Narrow width Throat portion 27: truncated conical portion 47: annular recess 48: [shaped gasket 49: horizontal portion 51: vertical portion 52: second annular gasket 53: horizontal portion 57: central opening 59: vertical wall 61: cylinder Shape recess 63: projection 65: pump body 67: horizontal flange section 69.71: annular projection 73: pump chamber 75: stem and screws 77: stem section assembly 79: 8l: 83; 85: 87: 89 = 93 : 95 : 97 : 99 : Piston part Outer passage Axial inlet hole Hollow recess Upper cylindrical protrusion Lower cylindrical protrusion Annular chamber Radial outer wall Radial inner wall Insert tube Two-step part: Spring

Claims (1)

Claims: 1. A spray dispensing pump comprising: means defining a substantially constant volume pump chamber having an opening at an inner end thereof; and a piston for reciprocating movement within the pump chamber. a pump stem having at its end a passageway therethrough, the outer end of the passageway being a dispensing outlet and the inner end being an axial inlet hole, integrally molded with the pump stem; a rigid valve member made of plastic, an outer portion having a first diameter terminating in a flat top portion, and a sealing surface having a predetermined diameter adjacent the flat top portion and sealing the axial inlet hole; an inner portion having a diameter larger than the first diameter and not more than three times the diameter of the sealing surface and a length corresponding to the range of movement of the piston; and a wide edge and a narrow inner portion. an intermediate portion having an opening near its outer end, with a width edge positioned between said inner portion and said outer portion to form a generally frustoconically inclined sloping recess; allowing communication between the inclined recess and the upper region of the inner part;
an intermediate portion inclined at an acute angle with respect to the axis of the inner portion;
a passage leading from the axially inner end of the inner portion to the inclined recess; and a ball having a diameter smaller than the diameter of the wide edge of the inclined recess, and is resiliently engaged in the inclined recess. the integrally molded plastic rigid valve member comprising a ball thereby forming a check valve with the inclined recess, the check valve forming an inlet valve member to the pump chamber; a throat located in an opening at the inner end of the chamber and having a smaller diameter than the ball and radially outward of the inner portion of the rigid valve member as the pump stem is depressed and the pump is actuated; a portion cooperating with said throat to form a surface-to-surface sealing means at said throat location to prevent flow from the pump chamber through said throat during pump dispensing operation; a throat; a liquid supply means for supplying liquid to the throat of the container; biasing the rigid valve member outwardly so that the axial inlet hole is occluded by the outer portion of the rigid valve member; The biasing means thereby also bias the pump stem outwardly, such that the cross-sectional area of the blocked axial inlet hole is smaller than the cross-sectional area of the end in the position in which the valve member is guided in a sealing manner. and a spray dispensing pump. 2. The spray dispensing pump of claim 1, wherein the rigid valve member is molded from polypropylene. 3. Slanted recesses at 10° and 20° with respect to the axis of the inner part
A spray dispensing pump according to claim 1, wherein the spray dispensing pump is tilted at an angle between. 4. The inner portion and the outer portion are each generally cylindrical in shape, the diameter of the wide edge of the sloping recess in the middle portion is greater than the diameter of the inner portion, and the outer portion and the middle portion are each generally cylindrical in shape;
joined by a plurality of ribs extending radially outwardly from the outer portion and joined to the wide edge of the intermediate portion, the spaces between the ribs being open and extending from the sloping recess above the inner portion. A spray dispensing pump as claimed in claim 1 forming an opening into a region. 5. The inner portion has a generally cylindrical outer surface, the outer surface having a reduced diameter cylindrical portion at its innermost end and joining the reduced diameter cylindrical portion to the remainder of the outer surface. A spray dispensing pump as claimed in claim 1, comprising a coupling part. 6. The spray dispenser of claim 1, wherein the inner portion has a generally cylindrical outer surface and further comprises a radial projection formed about the intermediate portion of the outer surface. pump. 7. The spray according to claim 6, wherein the radial projection is sloped and has a maximum radial extension, and a slot is formed extending from the outer surface of the inner part to the maximum radial extension. dispensing pump. 8. The spray dispensing pump of claim 6, wherein the radial projection is formed with an air passage. 9. The axial inlet hole has a frusto-conical inclined surface inclined at a predetermined angle, and the sealing surface is inclined in a frusto-conical form with an inclination angle equal to said frusto-conical inclined surface, so that the seal 2. A spray dispensing pump as claimed in claim 1, wherein the surface is adapted for tangential contact with the frusto-conically shaped inclined surface of the axial inlet bore. 10. Claim 1, further comprising an annular member forming a throat, the annular member being disposed at the inner end of the pump chamber and forming a protrusion for retaining the annular member in position. Spray dispensing pump as described. 11. The inner portion has a hollow recess whose inner end is open to receive the biasing means, and a narrow second throat is formed in the communication area between the hollow recess and the inclined recess. A spray dispensing pump according to claim 1. 12. A spray dispensing pump comprising means for defining a substantially constant volume pump chamber with an opening at an inner end thereof, and a piston at the end for reciprocating movement within said pump chamber. a pump stem having a passage therethrough, the outer end of which is a dispensing outlet, and the inner end of which is an axial inlet hole; and an integrally molded plastic rigid valve. a member, an outer portion terminating in a flat top portion and having a first diameter; a sealing surface adjacent the flat top portion having a predetermined diameter and sealing the axial inlet hole; generally frusto-conical in shape, with an inner portion having a length greater than a diameter and corresponding to the range of travel of the piston, and a wide edge and a narrow edge positioned between the inner and outer portions; with an intermediate portion forming an inclined recess which is inclined to;
intermediate inclined at an angle between 10° and 20° with respect to the axis of the inner part, having an opening near its outer end, thereby allowing communication between the inclined recess and the upper region of the inner part; a passageway leading from an axially inner end of said inner portion to said inclined recess; and a ball having a diameter smaller than the diameter of a wide edge of said inclined recess, said ball being rebound into said inclined recess; said integrally molded plastic rigid valve member comprising a ball engaged thereby forming a check valve with said inclined recess, said check valve forming an inlet valve member to said pump chamber; a throat located in an opening at the inner end of the pump chamber and having a smaller diameter than the ball, the throat of the inner portion of the rigid valve member as the pump stem is depressed and the pump is actuated; A radially outer portion cooperates with said throat to form a surface-to-surface sealing means at said throat location to prevent flow from the pump chamber through said throat during pump dispensing operation. a liquid supply means for supplying liquid to the throat of the container; and a liquid supply means for dispensing liquid to the throat of the container; biasing means for biasing and thereby also biasing the pump stem outwardly, such that the cross-sectional area of the blocked axial inlet hole is smaller than the cross-sectional area of the end in the position in which the valve member is guided in a sealing manner; and said biasing means. 13. The spray dispensing pump of claim 12, wherein the rigid valve member is molded from polypropylene. 14. the inner portion has a generally cylindrical outer surface;
13. The outer surface of claim 12, wherein the outer surface comprises a reduced diameter cylindrical portion at its innermost end and a connecting portion connecting the reduced diameter cylindrical portion to the remainder of the outer surface. Spray dispensing pump. 15. the inner portion has a generally cylindrical outer surface;
13. The spray dispensing pump of claim 12 further comprising a radial protrusion formed on said outer surface near an intermediate portion. 16. The spray of claim 15, wherein the radial projection is sloped and has a maximum radial extension and is formed with a slot extending from the outer surface of the inner part to the maximum radial extension. dispensing pump. 17. A spray dispensing pump comprising means for defining a substantially constant volume pump chamber with an opening at an inner end thereof, and a piston at the end for reciprocating movement within said pump chamber. a pump stem having a passage therethrough, the outer end of which is a dispensing outlet, and the inner end of which is an axial inlet hole; and an integrally molded plastic rigid valve. an outer portion terminating in a flat top portion and having a first diameter; a sealing surface sealing the axial inlet hole; and a sealing surface larger than the first diameter and corresponding to the range of travel of the piston. an inner portion having a length having a reduced diameter cylindrical portion at its innermost end and a connecting portion connecting the reduced diameter cylindrical portion to the remainder of the outer surface; and an intermediate portion forming an inclined recess generally frustoconically shaped with a wide edge and a narrow edge positioned between said inner and outer portions; an intermediate portion having an opening near the end, thereby allowing communication between the sloping recess and an upper region of the inner portion; and a passageway leading from the axially inner end of the inner portion to the sloping recess; a ball having a diameter smaller than the diameter of the wide edge of said sloping recess, and snapping into said sloping recess, thereby forming a check valve with said sloping recess; said integrally molded plastic rigid valve member having a ball forming an inlet valve member to the pump chamber; and a throat located at an opening in the inner end of the pump chamber and having a diameter smaller than said ball. and as the pump stem is depressed and the pump is actuated, a radially outer portion of the inner portion of the rigid valve member cooperates with the throat to form a surface-to-surface seal at the throat location. said throat forming means and adapted to prevent flow from said pump chamber through said throat during pump dispensing operation; and liquid supply means for supplying liquid to said throat of a container; biasing the rigid valve member outwardly so that the axial inlet hole is occluded by the outer portion of the rigid valve member, thereby causing the pump stem to also act as a biasing means for outwardly biasing the axial inlet hole; said biasing means, wherein the cross-sectional area of the axial inlet hole is smaller than the cross-sectional area of the end in the position in which the valve member is sealingly guided. 18. The spray dispensing pump of claim 17, wherein the rigid valve member is molded from polypropylene. 19. the inner portion has a generally cylindrical outer surface;
18. The spray dispensing pump of claim 17 further comprising a radial protrusion formed on said outer surface near an intermediate portion. 20. The spray of claim 19, wherein the radial projection is sloped and has a maximum radial extension and is formed with a slot extending from the outer surface of the inner part to the maximum radial extension. dispensing pump.